as the title says my air and heat will only blow out of the vents.. when i press the buttons from defrost and feet they light up as though they have changed but still air only comes from the vents- no warm feet and no defrosted windshield.. im assuming its a motor failure that changes the flow of air.. could it be something else? where should i start trouble shooting? thanks for any help!... btw its a 98 4dr accord 4cyl model.

When you press the buttons to change ventilation mode can you hear the humming of the mode control motor inside the heater unit? If you cannot hear the motor spin then there's a problem with the motor or the cabling. Do the test with engine not running and ventilator speed low.

Must be the mode control motor is not working (like you suggested in your first post). There's a good chance you can locate it under the dashboard on the driver's side, to the right of the throttle pedal. It has a seven wire connector attached to it.

appreciate the info, i was very worried i was going to have to dig and dig to find it somewhere deep in the dash.

I remember spending half a day taking out the center console, radio, instrument panel etc... only to find out that the ventilation control cable had come off because some day my foot had slipped off the throttle pedal... (car had manual ventilation controls)

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